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LM87 Datasheet(PDF) 1 Page - Texas Instruments |
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LM87 Datasheet(HTML) 1 Page - Texas Instruments |
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1 / 45 page  LM87 www.ti.com SNAS034J – APRIL 2000 – REVISED MARCH 2013 LM87 Serial Interface System Hardware Monitor with Remote Diode Temperature Sensing Check for Samples: LM87 1 FEATURES DESCRIPTION The LM87 is a highly integrated data acquisition 234 • Remote diode temperature sensing (2 system for hardware monitoring of servers, Personal channels) Computers, or virtually any microprocessor-based • 8 positive voltage inputs with scaling resistors system. In a PC, the LM87 can be used to monitor for monitoring +5 V, +12 V, +3.3 V, +2.5 V, power supply voltages, motherboard and processor Vccp power supplies directly temperatures, and fan speeds. Actual values for these inputs can be read at any time. Programmable • 2 inputs selectable for fan speed or voltage WATCHDOG limits in the LM87 activate a fully monitoring programmable and maskable interrupt system with • 8-bit DAC output for controlling fan speed two outputs (INT# and THERM#). • Chassis Intrusion Detector input The LM87 has an on-chip digital output temperature • WATCHDOG comparison of all monitored sensor with 8-bit resolution as well as the capability of values monitoring 2 external diode temperatures to 8-bit resolution, an 8 channel analog input ADC with 8-bit • SMBus™ or I2C Serial Bus interface resolution and an 8-bit DAC. A channel on the ADC compatibility measures the supply voltage applied to the LM87, • VID0-VID4 or IRQ0-IRQ4 monitoring inputs nominally 3.3 V. Two of the ADC inputs can be • On chip temperature sensor redirected to a counter that can measure the speed of up to 2 fans. A slow speed ΣΔ ADC architecture APPLICATIONS allows stable measurement of signals in an extremely noisy environment. The DAC, with a 0 to 2.5 V output • System Thermal and Hardware Monitoring for voltage range, can be used for fan speed control. Servers, Workstations and PCs Additional inputs are provided for Chassis Intrusion • Networking and Telecom Equipment detection circuits, and VID monitor inputs. The VID monitor inputs can also be used as IRQ inputs if VID • Office Electronics monitoring is not required. The LM87 has a Serial • Electronic Test Equipment and Bus interface that is compatible with SMBus™ and Instrumentation I2C™. KEY SPECIFICATIONS Connection Diagram • Voltage Monitoring Error ±2 % (max) • External Temperature Error ±4 °C (max) • Internal Temperature Error – −40 °C to +125 °C ± 3 °C (typ) • Supply Voltage Range 2.8 to 3.8 V • Supply Current 0.7 mA (typ) • ADC and DAC Resolution 8 Bits • Temperature Resolution 1.0 °C 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2 SMBus is a trademark of Intel Corporation. 3 I2C is a trademark of dcl_owner. 4 All other trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2000–2013, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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